Dec 02 12:19:34.393 INFO testing urbit-0.1.0 against 1.30.1 for beta-1.31-5
Dec 02 12:19:34.393 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-7/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/beta-1.31-5/1.30.1:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1.30.1 build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 02 12:19:34.652 INFO [stdout] 0de7fc022c6bbf5bd0f6310d87f81bfa7986547b30fcd5ed88251a58bf09290a
Dec 02 12:19:34.654 INFO running `"docker" "start" "-a" "0de7fc022c6bbf5bd0f6310d87f81bfa7986547b30fcd5ed88251a58bf09290a"`
Dec 02 12:19:35.142 INFO [stderr] usermod: no changes
Dec 02 12:19:35.224 INFO [stderr]    Compiling num-bigint v0.1.44
Dec 02 12:19:38.306 INFO [stderr]    Compiling num-rational v0.1.42
Dec 02 12:19:40.291 INFO [stderr]    Compiling num v0.1.42
Dec 02 12:19:40.987 INFO [stderr]    Compiling nock v0.4.0
Dec 02 12:19:42.872 INFO [stderr]    Compiling urbit v0.1.0 (/source)
Dec 02 12:19:43.957 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 12:19:43.958 INFO [stderr]  --> src/lib.rs:1:1
Dec 02 12:19:43.958 INFO [stderr]   |
Dec 02 12:19:43.958 INFO [stderr] 1 | #![feature(alloc_system)]
Dec 02 12:19:43.958 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 12:19:43.959 INFO [stderr] 
Dec 02 12:19:43.960 INFO [stderr] error: aborting due to previous error
Dec 02 12:19:43.960 INFO [stderr] 
Dec 02 12:19:43.960 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 12:19:43.968 INFO [stderr] error: Could not compile `urbit`.
Dec 02 12:19:43.968 INFO [stderr] 
Dec 02 12:19:43.968 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 12:19:43.970 INFO [stderr] su: No module specific data is present
Dec 02 12:19:44.908 INFO running `"docker" "inspect" "0de7fc022c6bbf5bd0f6310d87f81bfa7986547b30fcd5ed88251a58bf09290a"`
Dec 02 12:19:45.171 INFO running `"docker" "rm" "-f" "0de7fc022c6bbf5bd0f6310d87f81bfa7986547b30fcd5ed88251a58bf09290a"`
Dec 02 12:19:45.491 INFO [stdout] 0de7fc022c6bbf5bd0f6310d87f81bfa7986547b30fcd5ed88251a58bf09290a